Joe Turner wrote in message ...
THAT'S the joke... it doesn't make any sense!
Jerry was "just trying to keep up" and, not being much of a dirty-talker, formulated an utterly non-sensical retort.
Later at Monk's: GEORGE: "What does that mean? JERRY: "I have no idea!"
(P.S. - I LOVED it when Elaine sneaks in the line at the end as she leaves Jerry's apartment.)
--JKB